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Modulated one-dimensional structure of [Cd(NH3)3Ni(CN)4].
Václav Petrícek1, Michal Dusek, Juraj Cernák
1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague, Czech Republic. petricek@fzu.cz
Summary
The crystal structure of cadmium(II) and nickel(II) cyanide coordination polymer, [Cd(NH3)3Ni(CN)4], exhibits an incommensurate structure. This complex shows alternating octahedral and tetrahedral coordination for cadmium atoms within its chains.
Area of Science:
- Inorganic Chemistry
- Solid-State Chemistry
- Crystallography
Background:
- Coordination polymers exhibit diverse structures and properties.
- Incommensurate structures present unique challenges in crystallographic analysis.
- Understanding metal-ligand interactions is crucial for designing novel materials.
Purpose of the Study:
- To solve and refine the incommensurate crystal structure of [Cd(NH3)3Ni(CN)4].
- To investigate the nature of atomic modulations within the structure.
- To elucidate the coordination behavior of cadmium atoms.
Main Methods:
- Xcalibur point-detector diffractometry for data collection.
- Four-dimensional superspace group analysis for refinement.
- Analysis of satellite reflections up to the third order.
Main Results:
- The crystal structure was refined to an R value of 0.0371.
- A significant modulation affects all atoms, characterized by crenel and sawtooth functions.
- Cadmium atoms exhibit an incommensurate alternation between octahedral and tetrahedral coordination, with intermediate pentagonal coordination.
Conclusions:
- The [Cd(NH3)3Ni(CN)4] coordination polymer forms an incommensurate structure.
- The observed modulations dictate the alternating coordination geometry of cadmium ions.
- The study provides detailed insights into the complex structural behavior of this coordination compound.